1394 THE VOYAGE OF H.M.S. CHALLENGER. 



labelled "Zebu Harbour, Philippines, January 1875," which seems to be so close to 

 Hyperia schizogeneios as scarcely to admit of being placed in a separate species. ' The 

 features of difference which this specimen presents are that the head is ■ less deep ; the 

 wrist of the first gnathopods has on the straight hind margin two spines, one on and 

 three within the apex, and the straight hind margin of the hand is pretty strongly 

 pectinate on the lower part ; the third joint of the second gnathopods has four spines 

 about the apex, the wrist has the produced part beset with eight spines, the hand has 

 two on its front margin ; in the first perseopods the fourth joint is rather conspicuously 

 broad ; the hinder corners of the first three pleon-segments are squared, but perhaps 

 the actual angles a little more rounded than in the Atlantic specimen ; the first two 

 pairs of pleopods bave seven joints to each ramus, the third pair has six ; the telson is a 

 little more elongate. In case further comparison should make it necessary to distinguish 

 this form from the other, I should propose for it the name Hyperia zebui. The length 

 of the specimen is just over one-tenth of an inch. 



Hyperia gaudichaudii, Milne-Edwards (PL CLXIX.). 



1840. Hyperia Gaudichaudii, Milne-Edwards, Hist. Nat. des Crustaces, t. iii. p. 77. 



1849. „ „ Nicolet, in Hist. fis. y pol. de Chile por Claudio Gay, Zool., t. iii. 



18G2. Lestrigonus Gaudichaudii, Spence Bate, Brit. Mus. Catal. Ampli. Crust., p. 289, pi. xlviii. 



fig. 3. 

 1887. Hyperia Gaudichaudi, Bovallius, Systematical List of Amph. Hyper., Bihang till K. 



Svensk. Vetensk.-Akad. Handl., Bd. 11, No. 16, p. 16. 



A large stout species, the back, especially at the front part of the pleon, having an 

 imbricated appearance ; head shorter than its depth ; pergeon tumid, broader than the pleon ; 

 the first three pleon-segments with the postero-lateral angles acute, but the produced 

 points quite minute ; the specimens in spirits retaining a light or dark brown colour, but 

 with the uropods pale or almost white, the back in general covered with innumerable 

 specks of colouring darker than the ground-colour; one specimen curiously mottled with 

 wavy dark markings. The liver tubes with a crenate outline ; the heart narrow, strong- 

 walled. The following description refers to a male specimen : — 



Eyes occupying the sides of the head, dorsally separate, the dividing tract forming a 

 small triangle at the hind margin, a large one above the upper antennse, and a more or 

 less narrow line between these triangular spaces. 



Upper Antennse. — First joint of the peduncle broader than long, the second and third 

 successively narrower, and so short as to be transversely almost linear; first joint of the 

 fiagellum longer than the peduncle, broad, tapering, the breast carrying the usual brush of. 

 filaments ; the second joint broader than long, the third not longer than broad, the follow- 

 ing joints increasing in length, though not in regular gradation, slender, lightly ciliated. 



Lower Antennae. — The third (first free) joint of the peduncle stout, not longer than 



